-21=3z+15

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Solution for -21=3z+15 equation: 



-21=3z+15

We move all terms to the left:

-21-(3z+15)=0

We get rid of parentheses

-3z-15-21=0

We add all the numbers together, and all the variables

-3z-36=0

We move all terms containing z to the left, all other terms to the right

-3z=36

z=36/-3

z=-12

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